Supprimer les parenthèses puis réduire.
A=3-(a - b) +5+ (-a+b) + a
B=-3-(-a + b) + 5a-9+(-3a-5b)
C = -(x² + 7) + 6x-1-(15x² + 7x-3)
D = x²(3x² - 15x + 4) + (15x² - 12x² - x)​
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